High and low pressure operating balanced valve



Nov. 28, 1933. F. HENNEBHLE HIGH AND LOW` PRESSURE OPERATING BALNED VALVE' Filed May 18, 1931 l ,W Nmd HE@ Tm o Patented Nov. 28, 1933 UNITED "STATES HIGH AND LOW PRESSURE OPERATING BALANCED VALVE Frank Hennebhle, Chicago, Ill. Application May 1s, 1931. serial No. 538,376

2 Claims.

My invention relates to valves for controlling the operation of hydraulic cylinders and the like wherein liquid under high pressure is used. Heretoiore when high pressure liquids have been used the expense has been large due to the necessity of using a large quantity of liquid under high pressure which made it necessary to employ large reservoirs and keep pumping the liquids to high pressures over long periods of time.

With my invention provision is made to reduce this expense by enabling the use of low pressures for the initial movement of the hydraulic piston and only employing the high pressure liquid near the end of the stroke.

Further, my invention has for its object to provide in one unit a high pressure balanced valve for controlling the action of the high pressure liquid, a low pressure balanced valve for controlling the action of the low pressure liquid, and a balanced discharge valve for controlling the exhaust of liquid from the hydraulic cylinder.

Further, it is an object of the invention to provide means for effecting the opening of the valves by the expenditure of but little energy,

thus making them easy to operate by anyone.

Further, it is an object to provide means operable from the low pressure reservoir for opening all of the valves easily and in their proper order, and for remote control.

Other objects will in part be obvious and in part be pointed out hereinafter.

To the attainment of the aforesaid objects and ends, the invention still further resides in the novel details of construction, combination and arrangement of parts, all of which will be first fully described in the following detailed description, then be particularly pointed out in the appended claims, reference being had to the accompanying drawing, in which:

Figure 1 is a vertical longitudinal section of my invention taken on the line 1 1 of Figure 2.

Figure 2 is a horizontal section on the line 2 2 of Figure 1.

Figure 3 is a Vertical section on the line 3 3 of Figure 2.

Figure 4 is a vertical section on the line 4 4 of Figure 2.

Figure 5 is a diagrammatic view of the means for distributing low pressure fluid for operating the several valves.

1n the drawing in which like numerals of reference indicate like parts in all of the iigures, 1 represents the valve body which is provided With a low pressure luid intake 2, a high pressure uid intake 3, a discharge outlet 4, and a combined o utlet to and inlet from the hydraulic cylinder 6. The combined outlet and inlet 6 is separated from the intakes 2 and 3 and the discharge 4 by a suitable dividing wall or web vwhich also serves Vtoseparate the intakes. 2 and y3 from each other and from the discharge outlet 4.

7 designates threaded openings in the dividing wall 5 for the reception of the replaceable valve seat bushings 8, there being one opening 7 and one bushing 8 for each valve unit. Each of the bushings S has a Valve seat surface 9 to cooperate with the valve face 11 of the Valve head of the Valve unit that cooperates with it.

Each valve unit consists of a head 10 having a valve seat surface 11, an upper neck 12 having a collar 13 and a threaded shank 14.

15 is a piston which cooperates with the cup washer 17, the latter being held in place by lock nuts 16 as shown.

Below the valve head 10 there is a stem 18 provided with Wings 19 and with a lower collar 20. Beneath the collar 20 is the piston ring 21 on either side of which there is a cup washer 22 and 23, the washers and ring being held in place by look nuts 25 and a metallic washer 24.

26 designates the upper bushings which are threaded into apertures 27 of the body 1 and 28 designates the lower bushings which are also threaded into apertures 29 in the body 1, the axes of the bushings 26, 8 and 28 for each valve unit lying in alignment.

The lower bushings28 have caps 30 on their ends which are provided with threaded apertures '31, 32 and 33 respectively for connection by ducts 36, 37 and 38 to athree-way valve 34 which receives fluid from the `low pressure reservoir via a duct 35.

When the valve 34 is turned to line up with the duct 36 low pressure uid is admitted through the opening 31 into the cap 30 of the low pressure unit to open that valve. When moved from the position shown in Figure 5 so that the passage of the Valve 34 will line up with the duct 37 the low pressure uid will be cut off from the low pressure valve and applied to the high pressure valve. Similarly when the valve 34 is positioned y so that its opening lines up with the duct 38 the discharge valve will be opened'while the other two valves remain closed.

In using the inventionthe low pressure fluid valve unit is opened rst until the hydraulic piston has been raised as far as possible under low pressure and then that valve is closed and the high pressure valve is caused to function to complete the operation. Afterwards, when it is desired to lower the piston the discharge valve is opened which allows the spent fluid to be discharged from the cylinder to a suitable place.

From the foregoing description, taken in connection with the accompanying drawing, it is thought the complete construction, operation and advantages of the invention will be clear to those skilled in the art to which it relates.

What I claim is:

l. A valve body having a distinct high pressure inlet, a distinct low pressure inlet, and a distinct discharge outlet, and a combined outlet-inlet separated from said high pressure inlet, said low pressure inlet and said discharge outlet by a web or partition having valved passages from said inlets to said combined outlet-inlet and from said combined outlet-inlet to said discharge outlet, separate valve units for each valve passage, said body having aligning bores co-axial with each valve passage, bushings constituting cylinders mounted in said bores, said valve units each having pistons operated in said bushings, each of said valve units including a head with a valve seat, upper and lower stems projecting into said bushings, pistons carried by said stems and means for delivering low pressure iluid to the piston chambers to act on the bottoms of each valve piston for unseating the respective valves, said delivering means including means for selectively controlling the delivery of the low pressure iluid to the several piston chambers.

2. A valve body having a distinct high pressure inlet, a distinct low pressure inlet and a distinct discharge outlet, and a combined outlet-inlet separated from said high pressure inlet, said low pressure inlet and said discharge outlet by a web or partition having valved passages from said inlets to said combined outlet-inlet and from said combined outlet-inlet to said discharge outlet, separate valve units for each valve passage, said body having aligning bores coaxial with each valve passage, bushings constituting cylinders mounted in said bores, said valve units each having pistons operating in said bushings and means for delivering uid under pressure for acting on the piston of each valve unit for forcing it from its seat at will, which means for delivering fluid under pressure includes a chamber for the piston and means to admit fluid into said chamber` FRANK HENNEBHLE. 

